Hey @joqb, sorry you keep running into errors. I've never seen a bus error in ipyrad before. Can you please paste a screenshot or copy of the command/script you called and the full error that was returned. Thanks.

@dereneaton I'm tring runing subsequent BUCKy program. The problem is when I run "b.run_mrbayes(force=True, ipyclient=ipyclient)" the nex files will be removed (deleted), so the next "b.run_mbsum(ipyclient=ipyclient)" cannot be applied.